and by contributions to your pbs station from viewers like you. thank you. >> brown: for the second time in five months, a u.s. diplomatic post has been the target of a deadly assault. a suicide bomber detonated a vest with explosives outside the u.s. embassy in ankara, turkey, today, killing himself and a security guard. the white house described it as a terrorist attack. the explosion occurred around 1:15 p.m. local time. afterward, police tried to hold back the crowd gathered outside the u.s. facility in the turkish capital. debris littered the street near a side entrance where the blast took place. emergency workers wheeled one of the injured into an awaiting ambulance. u.s. ambassador to turkey francis ricciardone spoke to reporters outside the embassy. >> right now, we are all dealing with our sadness at the loss of our fellow member of our embassy. we salute his bravery, his service to turkey and to turkish-american friendship. our hearts go out to his family. >> brown: in istanbul, prime minister recep tayyip erdogan called the bombing an